#!/usr/bin/env godot -s
extends SceneTree

## Self-contained test runner for tactical-shooter.
## No framework dependencies.
##
## Usage:
##   godot --headless -s tests/runner.gd --path .
##
## Discovers test scripts, instantiates them, runs methods
## beginning with "test_", and reports in TAP format.

func _init():
	print("TAP version 14")
	print("1..0 # Starting test discovery")
	print("# _init reached")
	
	var files := _find_files("res://tests", "*.gd", ["runner.gd"])
	print("# Found %d test file(s)" % files.size())

	var total := 0
	var passed := 0
	var failed := 0
	var failures: Array[String] = []

	for f in files:
		var r := _run_script(f)
		total += r.total
		passed += r.passed
		failed += r.failed
		failures.append_array(r.failures)

	# Re-print header with real count
	print("1..%d" % total)

	for f in failures:
		print("#   FAIL  %s" % f)

	if failed > 0:
		print("# %d of %d tests failed" % [failed, total])
		quit(1)
	else:
		print("# All %d tests passed!" % total)
		quit(0)

# Result from running a test script
class RunResult:
	var total := 0
	var passed := 0
	var failed := 0
	var failures: Array[String] = []

func _find_files(dir_path: String, pattern: String, excludes: Array[String]) -> Array[String]:
	var result: Array[String] = []
	var dir := DirAccess.open(dir_path)
	if dir == null:
		push_error("Cannot open directory: %s" % dir_path)
		return result
	dir.list_dir_begin()
	var fname := dir.get_next()
	while fname != "":
		if fname.ends_with(".gd") and not fname in excludes and not fname.begins_with("."):
			result.append(dir_path.path_join(fname))
		fname = dir.get_next()
	dir.list_dir_end()
	return result

func _run_script(path: String) -> RunResult:
	var r := RunResult.new()
	var script := load(path)
	if script == null:
		push_error("Cannot load: %s" % path)
		return r

	if not script.has_method("new"):
		push_error("Cannot instantiate: %s" % path)
		return r

	var obj = script.new()
	var methods := _get_test_methods(script)

	print("# Running: %s (%d tests)" % [path, methods.size()])

	for m in methods:
		var test_name := m.trim_prefix("test_").replace("_", " ").capitalize()
		r.total += 1

		var ok := true
		var err_msg := ""
		var callable = Callable(obj, m)
		var result = callable.call()
		if result is String and result.length() > 0:
			ok = false
			err_msg = result

		if ok:
			r.passed += 1
			print("ok %d - %s" % [r.total, test_name])
		else:
			r.failed += 1
			print("not ok %d - %s" % [r.total, test_name])
			var file_line := "(unknown)"
			if obj.has_method("_get_current_line"):
				file_line = str(obj._get_current_line())
			r.failures.append("%s::%s: %s" % [path.get_file(), m, err_msg])

	if not obj is RefCounted:
		obj.free()
	return r

func _get_test_methods(script: Script) -> Array[String]:
	var result: Array[String] = []
	var methods := script.get_script_method_list()
	for m in methods:
		var name := m["name"] as String
		if name.begins_with("test_") and name != "_init":
			result.append(name)
	return result